Author(s)

P.H. Whitfield

Abstract

High frequency sampling of instream water quality variables produces a data record which contains seasonal, diurnal, transient, and noise components. These components are separated using a Fourier decomposition technique. This decomposition allows identification and classification of transient events induced both naturally and as a result of man's activity. Four transient events are used to illustrate the application of the methodology. 1 Introduction Most environmental processes are dominated by seasonal and diurnal cycles. Transients are relatively rare events which represent deviations from usual conditions. Transients may vary in frequency and amplitude of response and have durations from a few seconds to several days. They may occur naturally or as a result of man's activities [1,2,3,4]. Wa

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